3D –SERIES D-BLOCK ELEMENTS
21. Scandium
22. Titanium
23. Vanadium
24. Chromium
25.Manganese
26. Iron
27. Cobalt
28. Nickel
29. Copper
30. ZincFirst (3d) Transition Series (Sc-Zn)
| Group | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| At.no. | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| Element | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn |
| Config. | 3d14s2 | 3d24s2 | 3d34s2 | 3d54s1 | 3d54s2 | 3d64s2 | 3d74s2 | 3d84s2 | 3d104s1 | 3d104s2 |
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